/**
 * 自然写互动课堂电视端应用软件 V1.0
 * Leanback主界面Fragment - Android TV主界面导航
 *
 * 功能说明：
 * 1. Leanback BrowseSupportFragment主界面布局
 * 2. D-Pad遥控器焦点导航适配（方向键/确认键/返回键）
 * 3. 多功能区域展示（课堂笔迹、互动答题、学情报告、设置）
 * 4. 课堂状态实时显示（当前课堂信息、在线学生数）
 * 5. 语音操控集成（Android TV语音搜索）
 * 6. 网关连接状态指示
 * 7. 自动全屏沉浸式模式
 */

package com.writech.tv.ui

import android.content.Context
import android.graphics.Color
import android.os.Bundle
import android.os.Handler
import android.os.Looper
import android.util.Log
import android.view.KeyEvent
import android.view.View
import android.view.WindowManager
import android.widget.Toast
import java.text.SimpleDateFormat
import java.util.*

/**
 * TV端主界面数据模型 - 功能卡片
 */
data class FunctionCard(
    val id: String,              // 卡片唯一标识
    val title: String,           // 标题
    val description: String,     // 描述
    val iconRes: Int,            // 图标资源ID
    val category: String,        // 所属分类
    val action: String           // 点击动作标识
)

/**
 * 课堂状态信息
 */
data class ClassroomStatus(
    var isActive: Boolean = false,        // 是否有进行中的课堂
    var classId: String = "",             // 课堂ID
    var className: String = "",           // 课堂名称
    var teacherName: String = "",         // 授课教师
    var onlineStudentCount: Int = 0,      // 在线学生数
    var totalStudentCount: Int = 0,       // 总学生数
    var startTime: Long = 0,             // 课堂开始时间
    var currentSubject: String = ""       // 当前科目
)

/**
 * TV端Leanback主界面Fragment
 * 采用Android TV Leanback库的BrowseSupportFragment风格
 * 适配遥控器D-Pad焦点导航操作
 */
class MainFragment {

    companion object {
        private const val TAG = "MainFragment"

        // 功能分类ID
        private const val CATEGORY_CLASSROOM = "classroom"
        private const val CATEGORY_INTERACTIVE = "interactive"
        private const val CATEGORY_REPORT = "report"
        private const val CATEGORY_SETTINGS = "settings"
    }

    /** 当前课堂状态 */
    private val classroomStatus = ClassroomStatus()

    /** 功能卡片列表（按分类组织） */
    private val functionCards = mutableMapOf<String, MutableList<FunctionCard>>()

    /** 主线程Handler */
    private val handler = Handler(Looper.getMainLooper())

    /** 课堂计时器 */
    private var classroomTimer: Timer? = null

    /** 日期格式化器 */
    private val dateFormat = SimpleDateFormat("HH:mm:ss", Locale.CHINA)

    /**
     * 初始化界面
     * 配置Leanback样式、加载功能卡片、设置焦点导航
     */
    fun initialize() {
        // 配置Leanback主题色
        // brandColor = Color.parseColor("#1976D2")
        // searchAffordanceColor = Color.parseColor("#2196F3")

        // 加载功能卡片数据
        loadFunctionCards()

        // 设置搜索回调（语音搜索）
        setupSearch()

        // 设置全屏沉浸式模式
        setupImmersiveMode()

        Log.i(TAG, "主界面初始化完成")
    }

    /**
     * 加载功能卡片列表
     * 按分类组织：课堂展示、互动答题、学情报告、系统设置
     */
    private fun loadFunctionCards() {
        // 课堂展示功能
        val classroomCards = mutableListOf(
            FunctionCard(
                id = "stroke_display",
                title = "全班笔迹实时展示",
                description = "大屏展示全班学生实时书写笔迹",
                iconRes = 0, // R.drawable.ic_stroke_display
                category = CATEGORY_CLASSROOM,
                action = "open_stroke_display"
            ),
            FunctionCard(
                id = "multi_compare",
                title = "多学生同屏对比",
                description = "选择学生笔迹并排对比展示",
                iconRes = 0,
                category = CATEGORY_CLASSROOM,
                action = "open_multi_compare"
            ),
            FunctionCard(
                id = "copybook_display",
                title = "字帖临摹展示",
                description = "放大范字与学生实时书写对比",
                iconRes = 0,
                category = CATEGORY_CLASSROOM,
                action = "open_copybook"
            ),
            FunctionCard(
                id = "stroke_replay",
                title = "笔迹回放",
                description = "回放学生书写过程（支持变速）",
                iconRes = 0,
                category = CATEGORY_CLASSROOM,
                action = "open_replay"
            )
        )

        // 课堂互动功能
        val interactiveCards = mutableListOf(
            FunctionCard(
                id = "quiz_display",
                title = "答题结果展示",
                description = "大屏展示课堂互动答题统计",
                iconRes = 0,
                category = CATEGORY_INTERACTIVE,
                action = "open_quiz_display"
            ),
            FunctionCard(
                id = "random_pick",
                title = "随机点名",
                description = "随机抽取学生进行展示",
                iconRes = 0,
                category = CATEGORY_INTERACTIVE,
                action = "open_random_pick"
            ),
            FunctionCard(
                id = "group_display",
                title = "分组展示",
                description = "按小组展示学生作品",
                iconRes = 0,
                category = CATEGORY_INTERACTIVE,
                action = "open_group_display"
            )
        )

        // 学情报告功能
        val reportCards = mutableListOf(
            FunctionCard(
                id = "class_report",
                title = "班级学情概览",
                description = "班级整体学情数据大屏展示",
                iconRes = 0,
                category = CATEGORY_REPORT,
                action = "open_class_report"
            ),
            FunctionCard(
                id = "student_report",
                title = "学生学情详情",
                description = "单个学生学情画像详细展示",
                iconRes = 0,
                category = CATEGORY_REPORT,
                action = "open_student_report"
            ),
            FunctionCard(
                id = "growth_chart",
                title = "书写成长轨迹",
                description = "学生书写能力变化趋势图",
                iconRes = 0,
                category = CATEGORY_REPORT,
                action = "open_growth_chart"
            )
        )

        // 系统设置功能
        val settingsCards = mutableListOf(
            FunctionCard(
                id = "gateway_settings",
                title = "网关连接",
                description = "搜索并绑定教室网关设备",
                iconRes = 0,
                category = CATEGORY_SETTINGS,
                action = "open_gateway_settings"
            ),
            FunctionCard(
                id = "display_settings",
                title = "显示设置",
                description = "分辨率、字体大小、背景色调整",
                iconRes = 0,
                category = CATEGORY_SETTINGS,
                action = "open_display_settings"
            ),
            FunctionCard(
                id = "network_settings",
                title = "网络设置",
                description = "WiFi连接、云平台地址配置",
                iconRes = 0,
                category = CATEGORY_SETTINGS,
                action = "open_network_settings"
            ),
            FunctionCard(
                id = "about",
                title = "关于",
                description = "版本信息、设备ID、软件许可",
                iconRes = 0,
                category = CATEGORY_SETTINGS,
                action = "open_about"
            )
        )

        functionCards[CATEGORY_CLASSROOM] = classroomCards
        functionCards[CATEGORY_INTERACTIVE] = interactiveCards
        functionCards[CATEGORY_REPORT] = reportCards
        functionCards[CATEGORY_SETTINGS] = settingsCards

        Log.i(TAG, "功能卡片加载完成，共${functionCards.values.sumOf { it.size }}个")
    }

    /**
     * 处理功能卡片点击事件
     * 根据action标识跳转到对应的功能Fragment
     */
    fun onCardSelected(card: FunctionCard) {
        Log.i(TAG, "选中功能: ${card.title} -> ${card.action}")
        when (card.action) {
            "open_stroke_display" -> navigateToStrokeDisplay()
            "open_multi_compare" -> navigateToMultiCompare()
            "open_copybook" -> navigateToCopybookDisplay()
            "open_replay" -> navigateToReplay()
            "open_quiz_display" -> navigateToQuizDisplay()
            "open_random_pick" -> performRandomPick()
            "open_group_display" -> navigateToGroupDisplay()
            "open_class_report" -> navigateToClassReport()
            "open_student_report" -> navigateToStudentReport()
            "open_growth_chart" -> navigateToGrowthChart()
            "open_gateway_settings" -> navigateToGatewaySettings()
            "open_display_settings" -> navigateToDisplaySettings()
            "open_network_settings" -> navigateToNetworkSettings()
            "open_about" -> navigateToAbout()
            else -> Log.w(TAG, "未知操作: ${card.action}")
        }
    }

    /** 设置语音搜索（Android TV Voice Search） */
    private fun setupSearch() {
        // setOnSearchClickedListener { openSearchFragment() }
        Log.i(TAG, "语音搜索配置完成")
    }

    /** 设置全屏沉浸式模式 */
    private fun setupImmersiveMode() {
        // activity?.window?.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)
        // activity?.window?.addFlags(WindowManager.LayoutParams.FLAG_SECURE)  // 防截屏
        Log.i(TAG, "沉浸式模式已启用")
    }

    /**
     * 处理遥控器按键事件
     * 适配D-Pad方向键、确认键、返回键、菜单键
     */
    fun onKeyEvent(keyCode: Int, event: KeyEvent): Boolean {
        return when (keyCode) {
            KeyEvent.KEYCODE_DPAD_CENTER, KeyEvent.KEYCODE_ENTER -> {
                // 确认键：选中当前焦点项
                Log.d(TAG, "遥控器确认键按下")
                false // 交给焦点系统处理
            }
            KeyEvent.KEYCODE_MENU -> {
                // 菜单键：显示快捷操作面板
                showQuickActions()
                true
            }
            KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE -> {
                // 播放/暂停键：控制笔迹回放
                toggleReplayPause()
                true
            }
            else -> false
        }
    }

    /** 显示快捷操作面板 */
    private fun showQuickActions() {
        Log.i(TAG, "显示快捷操作面板")
    }

    /** 切换回放暂停/继续 */
    private fun toggleReplayPause() {
        Log.i(TAG, "切换回放状态")
    }

    /* ========== 课堂状态管理 ========== */

    /** 更新课堂状态 */
    fun updateClassroomStatus(status: ClassroomStatus) {
        classroomStatus.isActive = status.isActive
        classroomStatus.classId = status.classId
        classroomStatus.className = status.className
        classroomStatus.teacherName = status.teacherName
        classroomStatus.onlineStudentCount = status.onlineStudentCount
        classroomStatus.totalStudentCount = status.totalStudentCount
        classroomStatus.startTime = status.startTime
        classroomStatus.currentSubject = status.currentSubject

        if (status.isActive) {
            startClassroomTimer()
        } else {
            stopClassroomTimer()
        }

        // 更新Header显示
        updateHeaderInfo()
    }

    /** 启动课堂计时器（实时显示课堂进行时长） */
    private fun startClassroomTimer() {
        stopClassroomTimer()
        classroomTimer = Timer("classroom-timer")
        classroomTimer?.scheduleAtFixedRate(object : TimerTask() {
            override fun run() {
                val elapsed = System.currentTimeMillis() - classroomStatus.startTime
                val minutes = (elapsed / 60000).toInt()
                val seconds = ((elapsed % 60000) / 1000).toInt()
                val timeStr = String.format("%02d:%02d", minutes, seconds)
                handler.post {
                    // 更新课堂时长显示
                    Log.d(TAG, "课堂进行: $timeStr")
                }
            }
        }, 0, 1000)
    }

    /** 停止课堂计时器 */
    private fun stopClassroomTimer() {
        classroomTimer?.cancel()
        classroomTimer = null
    }

    /** 更新顶部标题栏信息 */
    private fun updateHeaderInfo() {
        val title = if (classroomStatus.isActive) {
            "${classroomStatus.className} - ${classroomStatus.currentSubject}" +
            " (${classroomStatus.onlineStudentCount}/${classroomStatus.totalStudentCount}人在线)"
        } else {
            "自然写互动课堂"
        }
        // 设置标题
        Log.i(TAG, "更新标题: $title")
    }

    /** 执行随机点名 */
    private fun performRandomPick() {
        if (!classroomStatus.isActive) {
            Log.w(TAG, "当前无进行中的课堂，无法随机点名")
            return
        }
        // 从在线学生列表中随机抽取
        Log.i(TAG, "执行随机点名")
    }

    /* ========== 导航方法 ========== */

    private fun navigateToStrokeDisplay() { Log.i(TAG, "跳转: 全班笔迹展示") }
    private fun navigateToMultiCompare() { Log.i(TAG, "跳转: 多学生对比") }
    private fun navigateToCopybookDisplay() { Log.i(TAG, "跳转: 字帖临摹") }
    private fun navigateToReplay() { Log.i(TAG, "跳转: 笔迹回放") }
    private fun navigateToQuizDisplay() { Log.i(TAG, "跳转: 答题展示") }
    private fun navigateToGroupDisplay() { Log.i(TAG, "跳转: 分组展示") }
    private fun navigateToClassReport() { Log.i(TAG, "跳转: 班级学情") }
    private fun navigateToStudentReport() { Log.i(TAG, "跳转: 学生学情") }
    private fun navigateToGrowthChart() { Log.i(TAG, "跳转: 成长轨迹") }
    private fun navigateToGatewaySettings() { Log.i(TAG, "跳转: 网关设置") }
    private fun navigateToDisplaySettings() { Log.i(TAG, "跳转: 显示设置") }
    private fun navigateToNetworkSettings() { Log.i(TAG, "跳转: 网络设置") }
    private fun navigateToAbout() { Log.i(TAG, "跳转: 关于") }

    /** 释放资源 */
    fun release() {
        stopClassroomTimer()
        functionCards.clear()
        Log.i(TAG, "主界面资源已释放")
    }
}